fix php 5.3 support for travis-ci

Author: arkadiusjonczek

.travis.yml

@@ -2,6 +2,11 @@ language: php
 
 sudo: false
 
+matrix:
+  include:
+    - php: 5.3
+      dist: precise
+
 php:
   - 5.3
   - 5.4